Charcoal. Nang bread oven, naan bread machine, highland barley oven, and naan pit oven are charcoal-heated food ovens and ovens. Product technical performance, popular marketing, used in baking and other industries, lowest cost, using ordinary Charcoal (machine-made charcoal or charcoal) can be used to quickly bake naan cakes, roast beef liver, roast pork liver, roast pig heart, etc., both of which are called Mongolian roast liver ovens, so highland barley cake ovens use charcoal.